Trailer for a bicycle



FIG. 1 is a perspective view of a trailer for a bicycle showing my new design, the broken lines shown are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a trailer for a bicycle, as shown and described. 